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map_sorter
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Sorts a list of maps per a list of sort specs.
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lib/map_sorter.ex
defmodule MapSorter do
@moduledoc """
Generates the AST to sort maps as per sort specs (ascending/descending keys).
"""
require Logger
@doc """
Takes a list of `maps` and either a list of `sort specs` or an AST
that will evaluate to a list of `sort specs` at runtime.
Returns the AST to sort the `maps` as per the `sort specs`.
`sort specs` can be implicit, explicit or mixed:
- [:dob, :name] is implicit ⇒ [asc: :dob, asc: :name]
- [:dob, desc: :name] is mixed ⇒ [asc: :dob, desc: :name]
- [asc: :dob, desc: :name] is explicit
## Examples
iex> require MapSorter
iex> people = [
...> %{name: "Mike", likes: "ski, arts", dob: "1992-04-15"},
...> %{name: "Mary", likes: "travels" , dob: "1992-04-15"},
...> %{name: "Ann" , likes: "reading" , dob: "1992-04-15"},
...> %{name: "Ray" , likes: "cycling" , dob: "1977-08-28"},
...> %{name: "Bill", likes: "karate" , dob: "1977-08-28"},
...> %{name: "Joe" , likes: "boxing" , dob: "1977-08-28"},
...> %{name: "Jill", likes: "cooking" , dob: "1976-09-28"}
...> ]
iex> MapSorter.log_level(:info) # :debug ⇒ debug messages
iex> fun = & &1
iex> sorted = %{
...> explicit: MapSorter.sort(people, asc: :dob, desc: :likes),
...> implicit: MapSorter.sort(people, [:dob, desc: :likes]),
...> function: MapSorter.sort(people, fun.([:dob, desc: :likes]))
...> }
iex> MapSorter.log_level(:info) # :info ⇒ no debug messages
iex> sorted.explicit == sorted.implicit and
...> sorted.explicit == sorted.function and
...> sorted.explicit
[
%{name: "Jill", likes: "cooking" , dob: "1976-09-28"},
%{name: "Bill", likes: "karate" , dob: "1977-08-28"},
%{name: "Ray" , likes: "cycling" , dob: "1977-08-28"},
%{name: "Joe" , likes: "boxing" , dob: "1977-08-28"},
%{name: "Mary", likes: "travels" , dob: "1992-04-15"},
%{name: "Mike", likes: "ski, arts", dob: "1992-04-15"},
%{name: "Ann" , likes: "reading" , dob: "1992-04-15"}
]
"""
defmacro sort(maps, sort_specs) do
Logger.debug("sort specs: #{inspect sort_specs}...")
sort_fun_ast =
case sort_specs do
specs when is_list(specs) -> specs
specs -> Macro.expand(specs, __CALLER__) # in case module attribute
end
|> MapSorter.Support.sort_fun_ast()
quote do: Enum.sort(unquote(maps), unquote(sort_fun_ast))
end
@doc """
Allows to change the log `level` at compile time.
"""
defmacro log_level(level), do: Logger.configure(level: level)
end